AHP-FSE-Based Risk Assessment and Mitigation for Slurry Balancing Shield Tunnel Construction

Table 1

Construction stage division and content of slurry balancing shield.

Stage division	Overview	Main construction operation content
Stage I	Preconstruction preparation	(1) Site preparation. Construction site, living and production facilities, and pipeline relocation; (2) Technical preparation. Construction organization and scheme, and pile measurement; (3) Human, machine, and material preparation. Construction team, facility inspection, and materials inspection
Stage II	Working well and shield preparation	(1) Enclosure, drainage, and support for working well; (2) Shield-related preparation shield machine transportation, pipe transportation, and slurry separation field
Stage III	Shield construction	Shield machine installation, test tunneling, and normal operation
Stage IV	Internal and auxiliary structure	(1) Inner structure; (2) Mechanical and electrical; (3) Accessory structure
Stage V	Clean and recovery	Internal structure cleaning, site cleaning, traffic, and greening restoration